Physics and life, physics tells us about life

Add some solids that can be soluble in water or liquids that are denser than water. Because the density of the human body is cubic meters. The density of water is cubic meters. Basically close to water. If the density of water is increased, then people will naturally be "squeezed" by water.

If you go for a swim and take a deep breath, then your density decreases and you will float up. Don't be afraid to play with this thing, it's also the basic skill of swimming.

Archimedes' principle: An object immersed in an immersion is subjected to an upward buoyant force equal to the gravitational force exerted by the liquid it distributes.

A definition is a formulation of a definition, and the definition is applied to the solution at any time.

Archimedes' principle defines the formula as follows: f float = g row.

Archimedes' Principle Buoyancy Formula (It can be said that it is a formula that can be used under certain conditions after being derived from the definition. ）：

Float G Drain P Liquid·V Drain·G

This is a universal formula that applies to any state in which the object is present.

float = g matter. Condition: The object floats or is suspended in a liquid.

float = g-g'

Condition: Knowing that the object is in liquid, the spring weighs the pulling force g on the object'size.

Float = f up - f down.

Condition: The object is regular, and the depth at which the object is immersed in the liquid is known.

Therefore, as long as the density of the liquid is greater than the average density of the human body in cubic meters, it is enough. Therefore, some non-toxic liquids such as saline (sodium chloride solution) can be used.

Add more salt so that the salt water is denser than human.

Non-toxic salts. Sodium chloride in general.

Increase the specific gravity. Please select me as the correct answer.

Add some salt, safe and convenient!

There is a lot to say about our education, and there is a huge room for improvement. I wonder if educators have really seriously thought about why there are so many children who are tired of school or deviate from science? Most of this is because teachers are unable to convey the beauty of the subject in education.

The teacher himself didn't know what the subject he was teaching meant exactly. Teachers don't have a way to connect the subject to anything, they just teach for the sake of teaching, and then students naturally feel that this is just like that, and they are less and less interested.

In the past two days, I have seen two laws of physics.

The law of inertia states that it takes a lot of energy to change the state of rest of an object, and once the object starts moving, much less energy is required to maintain the motion.

The momentum theorem states that the state of motion of an object in motion remains the same unless it is disturbed by an external force; A stationary object remains stationary until it is disturbed by an external force.

It's like us who want to do something. There is a saying that "everything is hard at the beginning." "It's likely that we've been planning it in our minds for a long time, but we just can't take the first step, which is easy to understand if you look at these two laws of physics.

Before we start doing things, we are at rest, and we need a lot of energy to move things.

So we need a lot of self-control to start a business or activity, but once you get started, it's much easier to stick with it. As Albert Einstein said, "Sport makes change." "We, too, start taking action and life will change.

There is also a saying called "21 days to develop a rule", that is, once the object begins to move, the energy required to maintain the motion is much smaller; When you get used to doing this, it's like moving at a constant speed, so you don't need any energy to continue well.

Whether it is physics, mathematics or other disciplines, when we combine them with real life, these disciplines are also flexible, just like when we walk across a bridge, we will automatically emerge mathematical principles in our minds, use those knowledge theorems, need a few steps of operation, and will also need physics and chemistry knowledge to select materials, think about how to build the bridge under our feet, this real thing that is connected to us, all the cells in our body will be mobilized.

In our education, we never try to show what the subjects are like in life, which makes students very confused, and they mistakenly think that learning knowledge and life are two different things, they can't connect, they don't feel useful, and they can't experience the joy of beauty, how can education really work?

Knowledge belongs to life, and life needs knowledge to support. They are never independent of each other.

Application of Physics Knowledge in Life: Knowledge of Mechanics.

When sharpening the kitchen knife, it is necessary to water it continuously, because the friction between the kitchen knife and the stone produces heat to increase the internal energy of the knife, the temperature rises, and the hardness of the knife edge becomes unfavorable to the knife edge. Watering is the use of heat transfer to reduce the energy in the kitchen knife, reduce the temperature, and not rise to too high.

Application of Physics Knowledge in Life: Knowledge of Thermals.

When boiling water, in order to save time and electricity, you can add a little hot water first. The purpose of this is to speed up the movement of the molecules, so that the diffusion of the molecules is accelerated.

Application of Physics Knowledge in Life: Acoustics Knowledge.

Nowadays, residential buildings are generally equipped with anti-theft nets, and there is a large rain shield made of thin iron sheets on the top of the nets, so that the things inside the anti-theft nets will not get wet. However, whenever it rains, the raindrops hit the rain shield and make a very loud clicking sound, and at night, this noise affects people's sleep, if you put a sponge on the iron sheet, then this noise can be reduced.

When we go to the store to buy bowls and porcelain, we tap the porcelain with our hands or other objects, and we can judge the quality of the porcelain by sound.

Application of Physics Knowledge in Life: Knowledge of Optics.

When washing a car under the scorching sun, the convex lens effect formed by water droplets will cause local high temperatures in the top layer of the car paint. Over time, the paint will lose its luster. If waxing is done at this time, it is easy to cause uneven color of the body. The car is generally washed in the evening or in the shade.

When taking pictures of the TV screen, the camera flash and indoor lighting should be turned off, so that the ** picture is clearer. Because the reflected light from the flash and lighting on the TV screen can interfere with the transmitted light of the TV picture.

I don't have one, but I can provide an idea.

It can be a combination of physical optics and a camera in life.

It can be a combination of physical mechanics and automotive ABS system.

It can be a combination of physical electromagnetism and modern generators.

A little suggestion, see the smile.

In the hot summer, the heat is pressing, and it is only comfortable to eat a popsicle! Have you ever noticed that popsicles are still steaming when they come out of the cooler? It's funny, usually only hot things steam out, so why do popsicles steam out?

The temperature in summer is much higher than that of popsicles, and the popsicles melt as soon as they come into contact with the air, and when they melt, they absorb a lot of heat from the surrounding air, causing the temperature of the air to drop. Normally, the air contains a certain amount of water vapor, and due to the sudden drop in temperature, it reaches a state of saturation or supersaturation. In other words, the air around the popsicle is no longer able to contain as much water vapor as it used to contain due to the decrease in temperature.

In this case, the excess water vapor forms tiny droplets, forming clouds of floating mist-like water droplets, which become white vapor when irradiated by light.

The same is true for the formation of clouds, fog, rain, and snow. The water in the rivers, lakes and seas, after being exposed to the sun, constantly turns into water vapor, floating in the air, the air containing water vapor is heated and rises, rises to a certain height, and when it encounters cold air, it condenses into a mass of suspended small water droplets, which is the cloud. The water vapor close to the ground can also form small suspended water droplets when it is cold, which is called fog.

So clouds and fog are essentially the same. Under the right conditions, the small droplets in the cloud merge into large droplets until the rising air flow can no longer support it, and then it falls down to form rain. In winter, these droplets crystallize into snowflakes and flutter all over the sky.

However, the condensation of saturated water vapor in the air must have its "core", which is the dust floating in the air, which is one of the necessary conditions for the formation of clouds, fog, rain and snow.

The secret of the clouds inspired the British physicist Wilson. After research, in 1894 he invented a device called the "cloud chamber", which was filled with clean air and saturated vapor of alcohol (or ether). If an invisible charged particle breaks in, it becomes the core of the condensation of the "cloud", forming fog spots, which show the "footprint" of particle movement.

Therefore, scientists can use the "cloud chamber" to observe the movement and changes of elementary particles (electrons, protons, etc.) that are invisible to the naked eye. At the same time, a number of new elementary particles have been discovered. Wilson's cloud chamber was awarded the Nobel Prize in Physics in 1927 for his outstanding contribution to the study of the microscopic world.

Maybe you can learn from (Applied Physics) and (Advances in Physical Chemistry) to find your own inspiration for writing.